Lantern for projection apparatus.



A. w. mamas. LANTERN FOR PROJECTION APPARATUS.

APPLICATION FILED MAR. 1 7. 191]- Patented Nov. 2?, 1917.

lFfig oiLlo z zrnmmmmm .rnn ens 'a rnnr orrion ALBERT W. JACOBS, OF ROCHESTER, NEW YORK, ASSIGNOR T ST HEADLIGHT dz LANTERN CO., OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

LANTERN FOE PROJECTION APPARATUS,

remain.

Specification of Letters Patent. Patemnhgail New, 2'7, 1191i '3',

- Application filed March 17, 1917. Serial No. 155,405.

To all whom it may sander n:

Be it known that I, ALBERT W. J AcoBs, a

I citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain tube and hood which are so connected together that both may be simultaneously removed from the lantern casing. A further object is to provide an inexpensive means for admitting air to the lamp casing.

To these and other ends, the invention consists of certain parts and combinations of parts all of which will be hereinafter described, the novelfeatures being pointed out in the appended claims.

In the-drawing Figure 1 is a view, in side elevation, of a lantern constructed in accordance with the present invention;

Fig. 2 is an'enlarged sectional viewon the line a-a, Fig. 1;

Fig. 3 is a sectional viewon the line b b, Fig. 2; and

Fig. 4c is a vertical sectional view through the lens tube'a-nd hood showing the conhousing. The lamp housing or casing is preferably formed by four vertical walls and a top and a Bottom Wall, 1 indicating the side walls, 2 the front side wall, an 3 the rear wall. The front wall is secur dto the side walls 2 in any suitable manner, and these in turn are connected by the top wall 4: and the bottom wall 5, thebottom wall, having upwardly turnedflanges Gabout the same fittingtwithinthe side walls 1 and the front wall 2, said at 7 under the bottom wall 5 to support the latter. The side walls 1 are also bent at their rear edges outwardly at 8 and thence inwardly at 9' to provide a groove 10, an outwardly extending portion 11 being whichco walls being turned inwardly formed on the inwardly turned portion 9 to strengthen the outer wall of said groove. \V1th1n the grooves 10 the rear wall 3 is adapted to slide. said wall havinga weight I 12 which normally hrlds the wall or closure 3 in closed position, and also having an inwardly turned flange 13 at its upper end to limit the downward movement of the wall or closure 0.

Any suitable light source may be mounted within the lamp housing, and in order to conduct the heat from'the interior of the housing the latter has vent openings at the top'and bottom thereof. In this instance,

the vent opening at the top is in the form of an annular flange 14: projecting upwardly from the top wall 4 of the housing and having a cap 15 arranged above the same in spaced relation to the flange in order that the heat may pass above the upper end of the flange 14: and thence downwardly around the lower end of the cap. The front wall 2 and the side walls 1 are provided with a number of openings 17 which, on the interior of the housing, may or may not be closed by foraminous material 18. On the exteriorun f the housing a groove or chamber 19 .is provided' communicating with said opening 17 and opening at the bottom, said chamber being preferably formed by asheet metal skirt 2O spaced from the side walls 1 and the front wall 2 below the uppermost portions of said openings 17 and having inwardly turned portions 21 at their upper'edges secured to said front wall and side walls.

A feature of this invention is the form and construction of the lens tube and hood mprises, in this instance, a cylindrical or tube portion 22 and a tapered or frusto-conical portion 23 forming the hood. Preferably these two parts are made of separate pieces of material, the'inner end of the tubular portion 22 being bent inwardly at 24; to ,form a flange or seat for the lens 25, while the hood portion is bent outwardly at 26 and thence about the tubular portion'22 at 27, so that-the joint between the hood portion 23 and the tubular portion 22wserves to support the flange or seat at the lens 25. With the object of holding the lens 25 to the seat 24, a holding or retaining ring 28. may be provided 50 s employed for securing the lens tube in posiwhich fits tightly the inner wall of the tubular portion 22 and has laterally turned flanges '29 and 30 at opposite ends forming lens seats, the seat 29 cooperating with the lens 25 and the ,seat 30 cooperating with the lens 31 which is received loosely within the opposite end of the tubular portion 22.

To connect the lens tube and hood to the lantern casing, the latter preferably has an annular flange 32 projecting from the front wall thereof about an opening in said wall,-

.22 is fitted within the sleeve 32. For looking the lens tube 22 within thesleeve 32 the lens tube may carry a pin 36 which is adapted to be passed into a bayonet slot 37 formed in the uppermost portion of the flange. By this arrangement the lens tube 22 and its hood 23 may be readily detached from the flange 32, while at the same time these parts are securely held to the -fl ange by the bayonet joint. As this joint'is located at the uppermost part of the flange 32, only one Qfsaid joints is necessary as the lower portion of the lens tube abuts the lens seat 35. Thelenses 25 and 3l are the usual. planoconvex type employed in condensing systems of projection apparatus.

From the foregoing it will be seen that there has been provided a lantern for pro- "jection apparatus which is inexpensive to manufacture. The ventilating means is of the simplest form,jpreventing the escape of light. The lamp casing is closed by a simple "slide in its rear wall, and the condensing i system is detachably supported on the front wall. The supporting means is in the form of a flange which is secured to the. lamp housing or casing in such a manner that the securing means acts as a support for one of the lenses of thelens tube, and at the same time permits a single bayonet joint to be tion. The lens tube carries the hood which forms a continua'tion of the tube and at the same time acts to strengthen or support the seat for that lens of the condensing sy's- H term which is situated at the juncturejof the. lens tube and the hood.

What I claim as my invention and desire to secure by Letters Patent is:

1'. In combination with a lamp housing having a projecting cylindrical flange formed with a lens seat, a combined lens tube and hood detachabl fitting within said flange, the lens tube being cylindrical and the hood tapering from said tube and forming an unbroken continuation of the latter, a lens seat at the junction of the hood and the tube, a lens resting against the last named seat, a lens resting against the lens seat of the flange, and a holding ring fitting in said lens tube and engaging both lenses.

2. A lantern for pro ection apparatus comprising a lamp casing, a circular flange projecting from said casing, a lens seat in said flange, a condensing lens abutting said seat, a tube fitting in and detachably interlocking with said flange, and a lens seat carried by said tube to engage the lens on the side thereof opposite the side engaged by the lens seat oflthe flange- 3. A lantern for rojection apparatus comprising a lamp casing, a tube projectin from said casing and havin one end turned inwardly to provide a seat or engaging one face of the lens,-a' lens holding ring fitting in said tube and having a seat for engaging the opposite face of a lens, and a tapered hood connected to said tube and bent to cooperate with thetube flange to strengthen the latter. '1-

4. A lantern'for projection apparatus having a light-proof top .wall provided with a vent opening, abottom' wall, light-proof sheet metal side walls having-their upper edges securedto the top wall and their lower edges secured to the bottom walh'said side walls having openings thereiri, a' lens tube projecting from one of the sidewalls above said ppenings, and-a horizontally-extending light-skirt closed at its top andsides and depending from said side walls .over the openings to form a chamberlopen at its bottom.

5. A lantern for projectionyappztratus comprising a housing or casingjjwith an about the opening being turned outwardly to overlap the inwardl turned ortion on the flange member, an a lens vtu detachaably fitted in said flange member.

ALBERT W. JACOBS. 

